SRDF/S and SRDF/A configuration involves tasks such as suspending and resuming the replication, failover from R1 side to R2, restoring R1 or R2 volumes from their BCV, and more. You perform these and other SRDF/S or SRDF/A operations using both symrdf and TimeFinder command symmir. The below details are for SRDF Pair states during SRDF procedure.SyncInProg :- A synchronization is currently in progress between the R1 and the R2. There are existing invalid tracks between the two pairs and the l... Read Full Story

SRDF/S and SRDF/A configuration involves tasks such as suspending and resuming the replication, failover from R1 side to R2, restoring R1 or R2 volumes from their BCV, and more. You perform these and other SRDF/S or SRDF/A operations using both symrdf and TimeFinder command symmir. The below details are for SRDF Pair states during SRDF procedure.SyncInProg :- A synchronization is currently in progress between the R1 and the R2. There are existing invalid tracks between the two pairs and the l... Read Full Story

Symmetrix Optimizer improves array performance by continuously monitoring access patterns and migrating devices to achieve balance across the disks in the array. This is process is carried out automatically based on user-defined parameters and is completely transparent to end users, hosts and applications in the environment. Migration is performed with constant data availability and consistent protection.Optimizer performs self-tuning of Symmetrix data configurations from the Symmetrix servic... Read Full Story

Symmetrix Optimizer improves array performance by continuously monitoring access patterns and migrating devices to achieve balance across the disks in the array. This is process is carried out automatically based on user-defined parameters and is completely transparent to end users, hosts and applications in the environment. Migration is performed with constant data availability and consistent protection.Optimizer performs self-tuning of Symmetrix data configurations from the Symmetrix servic... Read Full Story

A multipath requirement for different storage arrays:-All storage arrays: - Write cache must be disabled if not battery backed.Topology: - No single failure should cause both HBA and SP failover, especially with active-passive storage arrays.IBM TotalStorage DS 400 Family (formely FastT) –Defaul host type must be LNXCL or Host Type must be LNXCL orAVT (Auto Volume Transfer) is disabled in this host mode.HDS 99xx and 95xx family – HDS 9500V family (Thunder)- Requires two host modes:Host mo... Read Full Story

A multipath requirement for different storage arrays:-All storage arrays: - Write cache must be disabled if not battery backed.Topology: - No single failure should cause both HBA and SP failover, especially with active-passive storage arrays.IBM TotalStorage DS 400 Family (formely FastT) –Defaul host type must be LNXCL or Host Type must be LNXCL orAVT (Auto Volume Transfer) is disabled in this host mode.HDS 99xx and 95xx family – HDS 9500V family (Thunder)- Requires two host modes:Host mo... Read Full Story

Return code handling for Windows and UNIX The following lists the possible status or error codes that can be returned by the various SYMCLI commands on a Windows or UNIX platform and useful for troubleshooting.Code Code symbol Description___________________________________________________ 0 CLI_C_SUCCESS CLI -- call completed successfully. 1 CLI_C_FAIL CLI - call failed. 2 CLI_C_DB_FILE_IS_LOCKED- A... Read Full Story

EMC introduced PowerPath Confgiuration Checker tools for customer. I thought to share about this. It will be very useful for those guys who are using PowerPath as a host fail-over software. It checks existing configuration with EMC support matrix and give you details reports about your configuration whether existing configuration is as EMC support guidelines. This tool is currently available for Windows Operating system.It tests the following check:· OS version verification· M... Read Full Story

Any disk drive from any manufacturer can exhibit sector read errors due to media defects. This is a known and accepted reality in the disk drive industry, particularly with the high recording densities employed by recent products. These media defects only affect the drive’s ability to read data from a specific sector; they do not indicate general unreliability of the disk drive. The disk drives that EMC purchases from its vendors are within specifications for soft media errors according to th... Read Full Story

We have discussed about Virtual Provisioning of Symmetrix in previous post. Now, we will discuss about Virtual Provisioning Configuration. You have to understand your storage environment before you run the below mentioned command.Configuring and viewing data devices and pools:Data Devices are devices with datadev attribute. Only Data Devices can be part of Thin Pool. Devices with different protection scheme can be supported for use in Thin Pools. It is depending on specific Enginuity level. A... Read Full Story